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Instructions

If you already have made the Big Love Heart Gears then simply remove Gear 8 (the bottom gear) and the pin from the center block.
Print the modified Gear 8 (in the same color as the rest of the Big Love Heart Gears), the motor drive shaft and then the stand (in the desired color, I think black looks good here but I painted mine with metallic gold paint due to a shift in the Y-axis on my print, using PLA this is a lot of work).
You will need an AC power cord, synchronous AC motor, AC cord connector, lighted AC power switch (DPST), a 4 connecter terminal block, several 3mm screws and some glue.
There are two versions of the motor drive shaft. Version 1 is designed to be glued into the normal Heart Center piece and Version 2 is designed to be connected to the RHM Heart Center w/o any glue. The advantage is if somehow it gets broken it is much, much easier to replace but requires that you print out the Heart Center with the modified bottom hole to accept the Version 2 of the motor drive shaft.
In the motor base there are only the matching holes for the modified Gear8 but none for your AC motor. This is because there are so many different designs I thought it was easier to simply mark the holes and drill them in the old fashioned way.
I soldered wires to the AC connector and AC switch. The base was screwed into the modified Gear8 using three 3mm screws (because the 4th will be covered by my AC motor). The AC motor was then positioned to the center of the hole and the various holes in the motor were marked on the bottom of the base and drilled with a 2mm cordless drill. The motor was then fastened using four 3mm screws. A 4 conductor terminal block was glued to the bottom of the AC motor and used to connect the wires up properly. The AC connector was connected to the 0 (off) side of the AC switch and the 1 (on) side of the AC switch was connected to the AC motor. This way the light only lights when the motor is running. If wired the other way around then the light would always be lit as long as the AC connector is receiving power. The terminals were protected to prevent electrical shock from probing fingers.
Plug it in, turn it ON and enjoy!
You can view a video of the motorized Big Hear Gears in action on YouTube (below).https://www.youtube.com/watch?v=09_gzU3U-9U
At the request of AndreV added another HeartCenter with an even bigger hole to hold the V2 connector. This has been printed and approved by AndreV.

I remixed this and tried using an AC synchronous motor for the new version of the Heart Gears. The motor was sold as a power source for mirror balls up to 5Kg, it has a metal spindle which got way too hot for the PLA connector I designed. Back to the drawing board. Did you have any heat problems? Mine was fine but only for 10 minutes or so.